disp: msm: sde: avoid resource reservations clean up leak

Resource reservation of an atomic state should be cleared
irrespective of the state of a display. This change relaxes
the encoder - connector chain up check as this may not be
available during a modeset disable outputs scenario.

Change-Id: I8a51973b7c77787ff19d894458a1b73580b93de2
Signed-off-by: Prabhanjan Kandula <pkandula@codeaurora.org>